Have 1968 VW single cab transporter with 8 holes (dia about 5-6mm?) semetrically locatedd around the rear window. Does anyone out ther know what the holes might be for. They appear to be equally spaced and factory done(?). The canopy kits that I have seen do not attach to the body around the window. I have a photo if I can find a wayto send it I will. Thanks for any help you can give me. EJM